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Designing and Modeling of a Hybrid System Based on Electrodialysis for Desalinating Brine

Doostmohammadi, Mohammad Reza | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56133 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali; Hoseini, Vahid
  7. Abstract:
  8. The world's freshwater resources are rapidly decreasing due to population growth, industrial and technological progress, successive droughts, climate changes, increased food demand, and poor management of water resources. Using desalination methods is one of the ways to produce the required freshwater. Several methods have been developed for desalination. The most widely used method is reverse osmosis (RO). In this thesis, an electrodialysis (ED) desalination system was designed and modeled using up-to-date and reliable articles. This modeling was done in EES software and after validating that, the effect of considering Donnan's potential was investigated. At the 60 ppt concentration of the feed solution, the Donnan effect caused a 76% increase in the membrane area and a 13% increase in the specific energy consumption. Also, the effect of parameters such as the concentration of feed solution, the linear velocity of solution in desalination channels, and the product's flow rate on the system's efficiency and results were investigated. Next, a hybrid RO-ED system was designed, and the effect of returning the sewage flows to the feed solution was investigated. The modeling of this system was also done in EES software. With the help of this system, the recovery ratio was higher than the RO recovery ratio, and the combined system also solved the problem of destroying the RO membrane and the failure to purify non-ionic impurities by ED. In the end, suggestions for the development of this system were presented
  9. Keywords:
  10. Desalination ; Reverse Osmosis ; Electrodialysis System ; Hybrid System ; Water Resources Management ; Donnan Potential ; Desalination Plant

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